Hi, thanks for the encouraging comment! We do agree that we need to make improvements to performance, especially the courtyard scene has not been thoroughly optimized. This is one of the reasons we're showing this as an alpha preview; we believe it is the first version we can give out to people to show our vision and our work so far, but we're at the same time aware that there's still a lot to be done, including performance optimizations.
Out of curiosity, how do the other parts of the game run for you and what are your system specs?